Loud speaker power ratings
To use the full power potential of the Horizon only use good quality speakers of the correct power rating and
4 ohm impedance. Budget speakers will be less sensitive (not as loud) and may not cope with the high power
levels. Your dealer should be able to advise the most suitable types. If using 8 ohm speakers the power output
from the Horizon will drop by 40% so rate the speakers accordingly. The internal amplifiers of the Horizon have
clip limiter circuits which help reduce audible distortion when exceeding maximum power output. However,
damage can occur to loudspeakers if the Horizon is constantly over driven ie. If the red LEDs marked 1000W
on the AMP bargraphs are constantly illuminated.
Ventilation
The Horizon, although very efficient produces heat when used at high volume levels and uses a temperature
controlled fan to remove this heat so don't worry if warm air comes out of the cooling grille on the rear panel.
To allow the Horizon to function correctly and reliably, never place the rear of the unit closer than 100mm (4")
to a wall or object and keep the front air intake, just below the faders, free of any obstruction.
Feedback
Occurs when a microphone picks up sound from the loudspeakers connected to the Horizon and feeds it back
to the speakers - not very nice! The following points can help reduce this problem:
a).Keep microphones away from the front of the loudspeakers.
b).Don't use too much MID and HI tone control on channels used with microphones. These controls tend to
boost sounds that can cause feedback.
c).Microphone technique is important. Encourage the users to sing/talk directly into and not too far away from
the microphone.
Sound Sources
Most sound sources can be used with the Horizon although there are some exceptions:
Guitars generally have a very low signal output and not ideally suited to the jack inputs on the Horizon.
Finding it difficult to get enough volume and a good tone from the instrument is the typical problem. A guitar
pre-amplifier (DI box) should be used as it not only provides the guitarist with the right facilities but its output
will match the Horizon input perfectly.
Some microphones fitted with jack plugs may have too low a signal output. A clue to this is if the channel gain
and faders have to be set high or at maximum to get a good volume level and a hissing sound can be heard
from the loudspeakers. If this is the case the only solution is to use a better quality microphone with a balanced
wired XLR type connector.
Headphones
The best headphones to use with your Horizon are studio grade 250-400 ohm impendence types with covered
ear pad design. These give good clarity and reduce the ambient noise. Most types can be used with varying
results although 50 ohm impendence or lower should be avoided. Headphones are ideal when setting up,recording,
play back or just getting to know the controls on your Horizon.
11
16
The OUTPUT switch selects the source of the signal to be recorded. In the L-R MIX position the signal before
the MIX faders and GEQ is sent to the computer. For example, a live performance could be recorded as the
signal level is not altered by the MIX faders and not affected by the GEQ. In the DSP 1-2 position both DSP
buses can be routed to the computer. Useful for using computer based effects.
The INPUT switch selects where signals from the computer will be routed. In the P/BACK position the signal
routes to the PLAYBACK level control and on to the L-R MIX ideal for background music. In the CH11/12
(Horizon 2012) or CH19/20 (Horizon 2020) position the signal is routed to the adjacent stereo input channel.
This provides all the input channel facilities for playing backing tracks etc.
57.PLAYBACK input
RCA phono sockets
Connects to mp3, CD, computer devices for play back of pre-recorder material, although any line level source
can be used. The signal is routed to the PLAY BACK level control and on to the L-R MIX.
58.RECORD output
RCA phono sockets
The signal is sourced before the MIX faders and GEQ useful for example, recording a live performance as the
signal level is not altered by the MIX faders and not affected by the GEQ.
59.Foot Switch (FS) 1 & 2 sockets
¼” TS jack socket.
For the connection of an on/off latching foot switch to turn on or off DSP1 or DSP2. If only one foot switch is
connected to FS1 socket it automatically controls both DSPs. This function lets the performer turn off all effects
between songs so that clearer announcements can be made.
A suitable foot switch is supplied with the Horizon with an in built LED to indicate when the DSP is off.
60.DSP 1&2 SEND sockets
¼” TRS jack socket.
The DSP controls from each channel are mixed and then routed to the DSP effects and the output send sockets.
This is provided for the connection of external effects processors. The returning signal from the processor would
be connected to a stereo input channel.
61.AUX 1&2 SEND sockets
¼” TRS jack socket.
Aux output to feed on stage monitor systems. They can also be used to feed zones for different areas or functions
that require a different mix to the L-R MIX output.
62.AMP INSERT sockets
¼” TRS jack socket.
Insert point enabling the signal to the internal amplifiers to be routed to an external processor (such as that
required for certain speaker systems) and returned. The signal to the socket is sourced after (post) the L-R
MIX faders and the GEQ.
63.MIX2 OUTPUT sockets
¼” TRS jack socket.
Output from the MIX2 level control (44). If only the L/MONO socket is used the stereo signal is automatically
summed (mono'ed) making it suitable for, say, a single sub bass speaker system.
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